User equipment and method for transmitting synchronization signal block of same

ABSTRACT

A user equipment and a method for transmitting a synchronization signal block (SSB) of the same are provided. The method includes transmitting a resource set associated with an SSB within a subframe or slot, and the SSB includes a sidelink primary synchronization signal (S-PSS), a sidelink secondary synchronization signal (S-SSS), and 0 to 1 physical sidelink broadcast channel (PSBCH) between the S-PSS and S-SSS.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a continuation application of U.S.application Ser. No. 17/204,719 filed on Mar. 17, 2021, which is acontinuation application of International Application No.PCT/CN2019/108706, filed on Sep. 27, 2019, which claims priority to U.S.provisional application No. 62/739,539, filed on Oct. 1, 2018. Thepresent application claims priority and the benefit of theabove-identified applications and the above-identified applications areincorporated by reference herein in their entireties.

BACKGROUND OF DISCLOSURE 1. Field of Disclosure

The present disclosure relates to the field of communication systems,and more particularly, to a user equipment and a method for transmittinga synchronization signal block (SSB) of the same.

2. Description of Related Art

The development of wireless technologies for direct vehicle-to-vehicle(V2V) or vehicle-to-everything (V2X) communication as part ofintelligent transportation system (ITS) is gradually evolving frombroadcasting basic safety transmissions like periodic vehicle status andwarning messages to supporting more advanced use cases and services likeextended sensor data sharing, autonomous driving, and vehicleplatooning.

Under long term evolution-V2X (LTE-V2X) communication technologies aredeveloped by 3rd generation partnership project (3GPP) in release 14 andrelease 15. In release-16, V2X communication technologies are furtherdeveloped in new radio (NR) architectures, i.e., NR-V2X.

There is a need to propose a user equipment and a method fortransmitting a synchronization signal block (SSB) of the same capable ofperforming vehicle-to-everything (V2X) communication and improvingreliability.

SUMMARY

An object of the present disclosure is to propose an apparatus and amethod for transmitting a synchronization signal block (SSB) of the samecapable of performing UE-UE scheduling in vehicle-to-everything (V2X)communication and improving reliability.

In a first aspect of the present disclosure, a user equipment fortransmitting a synchronization signal block (SSB) includes a memory, atransceiver, and a processor coupled to the memory and the transceiver.The processor is configured to control the transceiver to transmit aresource set associated with an SSB within a subframe or slot, and theSSB includes sidelink primary synchronization signal (S-PSS), sidelinksecondary synchronization signal (S-SSS), and physical sidelinkbroadcast channel (PSBCH), and the resource set includes two orthogonalfrequency division multiplexing (OFDM) symbols used for the S-PSS, twoOFDM symbols used for the S-SSS, more than 1 OFDM symbol used for thePSBCH, and 0 to 1 OFDM symbol within the OFDM symbols used for the PSBCHis between the OFDM symbols for the S-PSS and the S-SSS, and positionsof the OFDM symbols used for the S-PSS are in front of positions of theOFDM symbols used for the S-SSS.

In a second aspect of the present disclosure, a method for transmittinga synchronization signal block (SSB) of a user equipment includestransmitting a resource set associated with an SSB within a subframe orslot, wherein the SSB includes sidelink primary synchronization signal(S-PSS), sidelink secondary synchronization signal (S-SSS), and physicalsidelink broadcast channel (PSBCH), and the resource set includes twoorthogonal frequency division multiplexing (OFDM) symbols used for theS-PSS, two OFDM symbols used for the S-SSS, more than 1 OFDM symbol usedfor the PSBCH, and 0 to 1 OFDM symbol within the OFDM symbols used forthe PSBCH is between the OFDM symbols for the S-PSS and the S-SSS, andpositions of the OFDM symbols used for the S-PSS are in front ofpositions of the OFDM symbols used for the S-SSS.

In a third aspect of the present disclosure, a non-transitorymachine-readable storage medium has stored thereon instructions that,when executed by a computer, cause the computer to perform the abovemethod.

In a fourth aspect of the present disclosure, a terminal device includesa processor and a memory configured to store a computer program. Theprocessor is configured to execute the computer program stored in thememory to perform the above method.

BRIEF DESCRIPTION OF DRAWINGS

In order to more clearly illustrate the implementations of the presentdisclosure or related art, the following figures will be described inthe implementations are briefly introduced. It is obvious that thedrawings are merely some implementations of the present disclosure, aperson having ordinary skill in this field can obtain other figuresaccording to these figures without paying the premise.

FIG. 1 is a block diagram of a user equipment and another user equipmentfor transmitting a synchronization signal block (SSB) according to animplementation of the present disclosure.

FIG. 2 is a flowchart illustrating a method for transmitting asynchronization signal block (SSB) of a user equipment according to animplementation of the present disclosure.

FIG. 3A is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 3B is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 3C is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 3D is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 4A is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 4B is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 5A is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 5B is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 6 is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 7A is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 7B is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 8A is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 8B is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 8C is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 9A is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 9B is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 9C is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 9D is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 10 is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 11A is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 11B is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 11C is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 11D is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 12 is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 13A is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 13B is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 13C is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 14 is a schematic diagram of an exemplary illustration of asynchronization signal block (SSB) according to an implementation of thepresent disclosure.

FIG. 15 is a block diagram of a system for wireless communicationaccording to an implementation of the present disclosure.

DETAILED DESCRIPTION OF IMPLEMENTATIONS

Implementations of the present disclosure are described in detail withthe technical matters, structural features, achieved objects, andeffects with reference to the accompanying drawings as follows.Specifically, the terminologies in the implementations of the presentdisclosure are merely for describing the purpose of the certainimplementation, but not to limit the disclosure.

In 3rd generation partnership project (3GPP) release 16, some newfeatures are being discussed, e.g., for new radio vehicle-to-everything(NR-V2X). For example, numerologies and waveforms of NR-V2X are underdiscussion. In long term evolution V2X (LTE-V2X), a sidelinksynchronization signal (SLSS) and a physical sidelink broadcast channel(PSBCH) are transmitted within a subframe or slot. There are twoorthogonal frequency division multiplexing (OFDM) symbols used for asidelink primary synchronization signal (S-PSS), two OFDM symbols usedfor a sidelink secondary synchronization signal (S-SSS), three OFDMsymbols used for a demodulation reference signal (DMRS), rest OFDMsymbols are used for the PSBCH, or an automatic gain control (AGC)symbol, or a guard period (GP) symbol. How to transmit the SLSS and thePSBCH in NR-V2X needs to be studied.

FIG. 1 illustrates that, in some implementations, a user equipment (UE)10 and another user equipment 20 for transmitting a synchronizationsignal block (SSB) according to an implementation of the presentdisclosure are provided. The UE 10 may include a processor 11, a memory12, and a transceiver 13. The UE 20 may include a processor 21, a memory22, and a transceiver 23. The processor 11 or 21 may be configured toimplement proposed functions, procedures and/or methods described inthis description. Layers of radio interface protocol may be implementedin the processor 11 or 21. The memory 12 or 22 is operatively coupledwith the processor 11 or 21 and stores a variety of information tooperate the processor 11 or 21. The transceiver 13 or 23 is operativelycoupled with the processor 11 or 21, and the transceiver 13 or 23transmits and/or receives a radio signal.

The processor 11 or 21 may include an application-specific integratedcircuit (ASIC), other chipsets, logic circuit and/or data processingdevices. The memory 12 or 22 may include a read-only memory (ROM), arandom access memory (RAM), a flash memory, a memory card, a storagemedium and/or other storage devices. The transceiver 13 or 23 mayinclude baseband circuitry to process radio frequency signals. When theimplementations are implemented in software, the techniques describedherein can be implemented with modules (e.g., procedures, functions, andso on) that perform the functions described herein. The modules can bestored in the memory 12 or 22 and executed by the processor 11 or 21.The memory 12 or 22 can be implemented within the processor 11 or 21 orexternal to the processor 11 or 21, in which those can becommunicatively coupled to the processor 11 or 21 via various means areknown in the art.

The communication between UEs relates to vehicle-to-everything (V2X)communication including vehicle-to-vehicle (V2V), vehicle-to-pedestrian(V2P), and vehicle-to-infrastructure/network (V2I/N) according to asidelink technology developed under 3rd generation partnership project(3GPP) release 14, 15, 16, and beyond. UEs communicate with each otherdirectly via a sidelink interface such as a PC5 interface.

FIG. 1 illustrates that, in some implementations, the processor 11 isconfigured to control the transceiver 13 to transmit a resource setassociated with an SSB within a subframe or slot, and the SSB includessidelink primary synchronization signal (S-PSS), sidelink secondarysynchronization signal (S-SSS), and physical sidelink broadcast channel(PSBCH), and the resource set includes two orthogonal frequency divisionmultiplexing (OFDM) symbols used for the S-PSS, two OFDM symbols usedfor the S-SSS, more than 1 OFDM symbol used for the PSBCH, and 0 to 1OFDM symbol within the OFDM symbols used for the PSBCH is between theOFDM symbols for the S-PSS and the S-SSS. , and positions of the OFDMsymbols used for the S-PSS are in front of positions of the OFDM symbolsused for the S-SSS.

In some implementations, the two OFDM symbols used for the S-PSS areadjacent OFDM symbols. The same S-PSS sequence is mapped on the two OFDMsymbols. In some implementations, the two OFDM symbols used for theS-SSS are adjacent OFDM symbols. The same S-SSS sequence is mapped onthe two OFDM symbols. In some implementations, a first OFDM symbol usedfor the PSBCH after the OFDM symbol used for the S-PSS includesresources used for DMRS which is configured to decode the PSBCH. In someimplementations, the DMRS occupies odd or even sub-carriers or resourceelements within a physical resource block (PRB). In someimplementations, parameters configured to determine a comb-like resourcemapping of the PSBCH are pre-configured or configured by a network. Insome implementations, frequency resources of the S-PSS and the S-SSS aresame.

In some implementations, the resource set includes a resource configuredto transmit the PSBCH, and the resource configured to transmit the PSBCHincludes a resource configured to transmit a PSBCH payload and aresource configured to transmit a demodulation reference signal (DMRS)which is configured to decode the PSBCH. In some implementations, withinthe SSB, there are a plurality of adjacent orthogonal frequency divisionmultiplexing (OFDM) symbols used for the S-PSS, there are a plurality ofadjacent OFDM symbols used for the S-SSS, there are 0 to 1 OFDM symbolused for the PSBCH, and positions of the adjacent OFDM symbols used forthe S-PSS are in front of positions of the adjacent OFDM symbols usedfor the S-SSS. In some implementations, the SSB further includes anautomatic gain control (AGC) symbol positioned in front of the S-PSS.

In some implementations, the AGC symbol is at beginning of the slot andmapped with the PSBCH or configured to pad bits. In someimplementations, the AGC symbol is comb-like mapped with the PSBCH. Insome implementations, the SSB further includes a guard period (GP)symbol positioned in rear of the S-SSS. In some implementations, the GPsymbol is left empty or the GP symbol is comb-like mapped with thePSBCH. In some implementations, frequency resources of the S-PSS and theS-SSS are same. In some implementations, the frequency resource includesfrequency resource size and/or starting position. In someimplementations, frequency resource sizes of the S-PSS and the S-SSS aresame. In some implementations, starting positions in a frequency domainof the S-PSS and the S-SSS are same. In another implementation, theS-SSS can also be in front of the S-PSS. In another implementation, theS-PSS can also be in between of the two OFDM symbols used for S-SSS.

In some implementations, the S-PSS is in front of the S-SSS or the S-SSSis in front of the S-PSS. In some implementations, for comb-likeresource mapping of a S-PSS sequence, a S-SSS sequence, and a PSBCHpayload, parameters configured to determine a comb-like resource mappingare pre-configured or configured by a network. In some implementations,the SSB is located at a frequency center of a carrier or a frequencylocation of the SSB is pre-configured or configured by a network. Insome implementations, a position of the SSB in a time domain ispre-configured or configured by a network. In some implementations, aperiodicity of the SSB is pre-configured or configured by a network. Insome implementations, a comb-like resource mapping of the S-PSS is ontoa first or last OFDM symbol of the SSB. In some implementations, acomb-like resource mapping of the S-SSS is onto a first or last OFDMsymbol of the SSB.

In some implementations, a comb-like resource mapping of the PSBCH isonto a first or last OFDM symbol of the SSB. In some implementations, ifthe S-PSS is comb-like mapped to one OFDM symbol, rest OFDM symbols usedfor the S-PSS are also comb-like mapped. In some implementations, if theS-SSS is comb-like mapped to one OFDM symbol, rest OFDM symbols used forthe S-SSS are also comb-like mapped.

FIG. 2 illustrates a method 200 for transmitting a synchronizationsignal block (SSB) of a user equipment according to an implementation ofthe present disclosure. In some implementations, the method 200includes: a block 202, transmitting a resource set associated with anSSB within a subframe or slot, wherein the SSB includes sidelink primarysynchronization signal (S-PSS), sidelink secondary synchronizationsignal (S-SSS), and physical sidelink broadcast channel (PSBCH), and theresource set includes two orthogonal frequency division multiplexing(OFDM) symbols used for the S-PSS, two OFDM symbols used for the S-SSS,more than 1 OFDM symbol used for the PSBCH, and 0 to 1 OFDM symbolwithin the OFDM symbols used for the PSBCH is between the OFDM symbolsfor the S-PSS and the S-SSS, and positions of the OFDM symbols used forthe S-PSS are in front of positions of the OFDM symbols used for theS-SSS.

In some implementations, the two OFDM symbols used for the S-PSS areadjacent OFDM symbols. The same S-PSS sequence is mapped on the two OFDMsymbols. In some implementations, the two OFDM symbols used for theS-SSS are adjacent OFDM symbols. The same S-SSS sequence is mapped onthe two OFDM symbols. In some implementations, a first OFDM symbol usedfor the PSBCH after the OFDM symbol used for the S-PSS includesresources used for DMRS which is configured to decode the PSBCH. In someimplementations, the DMRS occupies odd or even sub-carriers or resourceelements within a physical resource block (PRB). In someimplementations, parameters configured to determine a comb-like resourcemapping of the PSBCH are pre-configured or configured by a network. Insome implementations, frequency resources of the S-PSS and the S-SSS aresame.

In some implementations, the resource set includes a resource configuredto transmit the PSBCH, and the resource configured to transmit the PSBCHincludes a resource configured to transmit a PSBCH payload and aresource configured to transmit a demodulation reference signal (DMRS)which is configured to decode the PSBCH. In some implementations, withinthe SSB, there are a plurality of adjacent orthogonal frequency divisionmultiplexing (OFDM) symbols used for the S-PSS, there are a plurality ofadjacent OFDM symbols used for the S-SSS, there are 0 to 1 OFDM symbolused for the PSBCH, and positions of the adjacent OFDM symbols used forthe S-PSS are in front of positions of the adjacent OFDM symbols usedfor the S-SSS. In some implementations, the SSB further includes anautomatic gain control (AGC) symbol positioned in front of the S-PSS.

In some implementations, the AGC symbol is at beginning of the slot andmapped with the PSBCH or configured to pad bits. In someimplementations, the AGC symbol is comb-like mapped with the PSBCH. Insome implementations, the SSB further includes a guard period (GP)symbol positioned in rear of the S-SSS. In some implementations, the GPsymbol is left empty or the GP symbol is comb-like mapped with thePSBCH. In some implementations, frequency resources of the S-PSS and theS-SSS are same. In some implementations, the frequency resource includesfrequency resource size and/or starting position. In someimplementations, frequency resource sizes of the S-PSS and the S-SSS aresame. In some implementations, starting positions in a frequency domainof the S-PSS and the S-SSS are same. In another implementation, theS-SSS can also be in front of the S-PSS. In another implementation, theS-PSS can also be in between of the two OFDM symbols used for S-SSS.

In some implementations, the S-PSS is in front of the S-SSS or the S-SSSis in front of the S-PSS. In some implementations, for comb-likeresource mapping of a S-PSS sequence, a S-SSS sequence, and a PSBCHpayload, parameters configured to determine a comb-like resource mappingare pre-configured or configured by a network. In some implementations,the SSB is located at a frequency center of a carrier or a frequencylocation of the SSB is pre-configured or configured by a network. Insome implementations, a position of the SSB in a time domain ispre-configured or configured by a network. In some implementations, aperiodicity of the SSB is pre-configured or configured by a network. Insome implementations, a comb-like resource mapping of the S-PSS is ontoa first or last OFDM symbol of the SSB. In some implementations, acomb-like resource mapping of the S-SSS is onto a first or last OFDMsymbol of the SSB.

In some implementations, a comb-like resource mapping of the PSBCH isonto a first or last OFDM symbol of the SSB. In some implementations, ifthe S-PSS is comb-like mapped to one OFDM symbol, rest OFDM symbols usedfor the S-PSS are also comb-like mapped. In some implementations, if theS-SSS is comb-like mapped to one OFDM symbol, rest OFDM symbols used forthe S-SSS are also comb-like mapped.

In some implementations, a resource set which is used to transmit SLSSand PSBCH can be called as an SSB. The SSB can be transmitted within asubframe or slot. The SSB includes at least S-PSS, S-SSS, and PSBCH. Itcan be understood that a resource that is used for transmitting PSBCHincludes both a resource used for transmitting a PSBCH payload and aresource used for transmitting a DMRS which is used for decoding thePSBCH.

FIGS. 3A, 3B, 3C, and 3D illustrate that, in some implementations,within an SSB, there are two adjacent OFDM symbols used for S-PSS, twoadjacent OFDM symbols used for S-SSS, more than 1 OFDM symbol used for aPSBCH.

FIG. 3A illustrates that, in some implementations, within an SSB, thereare two adjacent OFDM symbols used for S-PSS, two adjacent OFDM symbolsused for S-SSS. The OFDM symbols of the S-PSS are at the beginning ofthe SSB. There are two adjacent OFDM symbols used for the S-SSS and theOFDM symbols of the S-SSS are at the end of the SSB. The OFDM symbols ofthe PSBCH are between the S-PSS and the S-SSS. There are more than 1OFDM symbol used for the PSBCH. In some implementations, there is 0 or 1OFDM symbol used for the PSBCH between the S-PSS and the S-SSS.

FIG. 3B illustrates that, in some implementations, within an SSB, thereare two adjacent OFDM symbols used for S-PSS, the OFDM symbols of theS-PSS are at the beginning of the SSB. There are 2 OFDM symbols used forthe PSBCH. One OFDM symbol of the PSBCH is before a position of S-SSSsymbol and another OFDM symbol of the PSBCH is after a position of S-SSSsymbol. For example, within the SSB, 1st and 2nd OFDM symbols used forthe S-PSS, 3rd and 6th OFDM symbols used for the PSBCH, 4th and 5th OFDMsymbols used for the S-SSS.

FIG. 3C illustrates that, in some implementations, within an SSB, OFDMsymbols for S-PSS are at the beginning of the SSB. There are 3 OFDMsymbols used for a PSBCH. Two OFDM symbols of the PSBCH are before aposition of S-SSS symbol and another OFDM symbol of the PSBCH is after aposition of S-SSS symbol. For example, within the SSB, 1st and 2nd OFDMsymbols used for the S-PSS, 3rd, 4^(th), and 7th OFDM symbols used forthe PSBCH, and 5th and 6th OFDM symbols used for the S-SSS.

FIG. 3D illustrates that, in some implementations, within an SSB, OFDMsymbols for S-PSS are at the beginning of the SSB. There are 4 OFDMsymbols used for a PSBCH. Two OFDM symbols of the PSBCH are before aposition of S-SSS OFDM symbols and another two OFDM symbols of the PSBCHare after a position of S-SSS OFDM symbols. For example, within the SSB,1st and 2nd OFDM symbols used for the S-PSS, 3rd, 4th, 7th, and 8th OFDMsymbols used for the PSBCH, and 5th and 6th OFDM symbols used for theS-SSS.

In all of the above implementations, a frequency resource of PSBCH canbe larger than the S-PSS and the S-SSS. For example, 24 resource blocks(RBs) used for the PSBCH per an OFDM symbol, and only 12 RBs used forthe S-PSS or the S-SSS per an OFDM symbol. If a frequency resource ofthe PSBCH is larger than the S-PSS and/or the S-SSS, a part of afrequency resource on the OFDM symbols used for the S-PSS and/or theS-SSS can also be used for the PSBCH, which is illustrated in FIGS. 4Aand 4B. The frequency resources of the PSBCH and the S-SSS can bealigned, or the frequency resources of the PSBCH and the S-PSS can bealigned.

FIGS. 4A and 4B are an illustration of how to map the PSBCH on the OFDMsymbols used for the S-PSS and/or the S-SSS of FIG. 3D. The mechanismcan also be applied to other figures such as FIGS. 3A, 3B, and 3C.

In all of the above implementations, resources used for a PSBCHtransmission includes resources used for both a PSBCH payload and aDMRS. There are two candidate ways to multiplex the DMRS and the PSBCHpayload, which is illustrated in FIGS. 5A and 5B.

In FIG. 5A, the DMRS are mapped to some resource element of the resourceblock (RB) which is used to map the PSBCH payload. There is one out of Kresource elements used for the DMRS within the RB. For example, withinthe RB, there are 12 resource elements in a frequency domain, with anindex range from 0 to 11. The DMRS can occupy the even or odd resourceelements per RB. This multiplexing scheme can be applied to a cyclicprefix orthogonal frequency division multiplexing (CP-OFDM) system.

In FIG. 5B, the DMRS can occupy a separate OFDM symbol which isdifferent with the OFDM symbols used for the PSBCH payload. For example,in In FIG. 3D, the 3rd and 7th OFDM symbols are used for the DMRS, the4th and 8th OFDM symbols are used for the PSBCH payload. Thismultiplexing scheme can be applied to a discrete fourier transformspread orthogonal frequency division multiplexing (DFT-s-OFDM) system.

In all of the above implementations, there can be one additional OFDM infront of the first OFDM of the SSB that is used as AGC, and/or oneadditional OFDM symbol after the last OFDM symbol of the SSB that isused as guard period (GP). One illustration of FIG. 3A with additionalAGC and GP symbols is illustrated in FIG. 6 . The AGC symbol can bemapped with the PSBCH or padding bits. In some implementations, if AGCsymbol is mapped with the PSBCH, comb-like resource mapping can beapplied, which is similar as the first OFDM symbol in FIG. 7A, the restresource elements that are not mapped by the PSBCH are left empty. TheGP symbol can be left empty. Or the GP symbol can be comb-like mapped bythe PSBCH which is similar as the last OFDM symbol in FIG. 7A, the restresource elements that are not mapped by the PSBCH are left empty.

FIGS. 7A and 7B illustrate that, in some implementations, the OFDMsymbols are used for the S-PSS and the S-SSS, comb-like resource mappingis applied to a S-PSS sequence and a S-SSS sequence separately.

FIG. 7A illustrates that, in some implementations, within an SSB, thereare one OFDM symbol used for a S-PSS, one OFDM symbol used for a S-SSS,more than 1 OFDM symbol used for a PSBCH. The OFDM symbol used for theS-PSS is at the beginning of the SSB. The OFDM symbol used for the S-SSSis at the end of the SSB. A S-PSS sequence is mapped to one resourceelement per A resource elements on the S-PSS OFDM symbol, i.e., thenumber of resource elements of adjacent S-PSS signal on the S-PSS OFDMsymbol is A. A S-SSS sequence is mapped to one resource element per Bresource elements on the S-SSS OFDM symbol, i.e., the number of resourceelements of adjacent S-SSS signal on the S-SSS OFDM symbol is B. Therest resource elements that are not mapped by the S-PSS or S-SSSsequence on the S-PSS or S-SSS OFDM symbols are left empty.

FIG. 7B illustrates that, in some implementations, within an SSB, thereare two OFDM symbols used for S-PSS, two OFDM symbols used for a S-SSS,more than 1 OFDM symbol used for a PSBCH. The two OFDM symbols used fora S-PSS are adjacent in time domain. The two OFDM symbols used for theS-SSS are adjacent in a time domain. The OFDM symbols used for the S-PSSare at the beginning of the SSB. The OFDM symbols used for the S-SSS areat the end of the SSB. A S-PSS sequence is mapped to one resourceelement per C resource elements on the S-PSS OFDM symbol, i.e., thenumber of resource elements of adjacent S-PSS signal on the S-PSS OFDMsymbol is C. A S-SSS sequence is mapped to one resource element per Dresource elements on the S-SSS OFDM symbol, i.e., the number of resourceelements of adjacent S-SSS signal on the S-SSS OFDM symbol is D. Therest resource elements that are not mapped with the S-PSS or S-SSSsequence on the S-PSS or S-SSS OFDM symbols are left empty.

For example, on the S-PSS OFDM symbol, the S-PSS sequence is mapped toeven resource elements. On the S-SSS OFDM symbol, the S-SSS sequence ismapped to even resource elements. In another example, on the S-PSS OFDMsymbol, the S-PSS sequence is mapped to even resource elements. On theS-SSS OFDM symbol, the S-SSS sequence is mapped to odd resourceelements. In some implementations of FIGS. 7A and 7B, the resources usedfor a PSBCH transmission includes the resources used for both PSBCHpayload and DMRS. The two candidate ways to multiplex DMRS and PSBCHpayload, which is illustrated in FIGS. 5A and 5B, are also applied forthese implementations. In some implementations of FIGS. 7A and 7B, ifthe frequency resource of PSBCH is larger than S-PSS and S-SSS, part ofthe frequency resource on the OFDM symbols used for S-PSS and/or S-SSScan also be used for PSBCH to align the frequency resource between PSBCHand S-SSS, or between PSBCH and S-PSS. One illustration is illustratedin FIGS. 8A, 8B, and 8C. In FIGS. 8A and 8B, the PSBCH which is mappedto the OFDM symbols of S-PSS and S-SSS using the same comb-like mappingscheme as S-PSS and S-SSS. In FIG. 8C, the PSBCH which is mapped to thefirst S-PSS OFDM symbol, and the second S-SSS OFDM symbol, uses the samecomb-like mapping scheme as S-PSS and S-SSS. The PSBCH which is mappedto the second S-PSS OFDM symbol, and the first S-SSS OFDM symbol, ismapped to all the resource elements per RB that is to be mapped forPSBCH.

FIGS. 9A, 9B, 9C, and 9D illustrate that, in some implementations,within an SSB, the first and last OFDM symbols are used for PSBCH.Comb-like resource mapping is applied to PSBCH on the first and lastOFDM symbols. The rest resource elements on the first and last OFDMsymbols which are not mapped by PSBCH are left empty. FIG. 9Aillustrates that, in some implementations, within an SSB, there are twoOFDM symbols used for PSBCH, one OFDM symbol for S-PSS and one OFDMsymbol for S-SSS. Within an SSB, the 2nd OFDM symbol is used for S-PSS,the 3rd OFDM symbol is used for S-SSS. FIG. 9B illustrates that, in someimplementations, within an SSB, there are three OFDM symbols used forPSBCH, one OFDM symbol for S-PSS and one OFDM symbol for S-SSS. Withinan SSB, the 1st, 3rd, 5th OFDM symbols are used for PSBCH, 2nd OFDMsymbol for S-PSS, and 4th OFDM symbol are used for S-SSS. FIG. 9Cillustrates that, in some implementations, within an SSB, there are fourOFDM symbols used for PSBCH, one OFDM symbol for S-PSS and one OFDMsymbol for S-SSS. Within a SSB, the 1st, 2nd, 5th, 6th OFDM symbols areused for PSBCH, 3rd OFDM symbol is used for S-PSS, and 4th OFDM symbolis used for S-SSS. FIG. 9D illustrates that, in some implementations,within an SSB, there are four OFDM symbols used for PSBCH, one OFDMsymbol is used for S-PSS and one OFDM symbol is used for S-SSS. Withinan SSB, the 1st, 3rd, 4th, and 6th OFDM symbols are used for PSBCH, 2ndOFDM symbol is used for S-PSS, and 5th OFDM symbol is used for S-SSS.FIGS. 9A, 9B, 9C, and 9D illustrate that, in some implementations, theresources used for PSBCH transmission includes the resources used forboth PSBCH payload and DMRS. The two candidate ways to multiplex DMRSand PSBCH payload, which is illustrated in FIG. 5 , are also applicablefor FIGS. 9A, 9B, 9C, and 9D. One illustration multiplexing between DMRSand PSBCH payload of FIG. 9A is illustrated in FIG. 10 . FIGS. 9A, 9B,9C, and 9D illustrate that, in some implementations, if the frequencyresource of PSBCH is larger than S-PSS and S-SSS, part of the frequencyresource on the OFDM symbols used for S-PSS and/or S-SSS can also beused for PSBCH to align the frequency resource between PSBCH and S-SSS,or between PSBCH and S-PSS.

FIGS. 11A, 11B, 11C, and 11D illustrate that, in some implementations,within an SSB, the first and last OFDM symbols are used for PSBCH.Comb-like resource mapping is applied to PSBCH on the first and lastOFDM symbols. The rest resource elements on the first and last OFDMsymbols which are not mapped by PSBCH are left empty. Within an SSB,there are two adjacent OFDM symbols used for S-PSS, two adjacent OFDMsymbols used for S-SSS. FIG. 11A illustrates that, in someimplementations, within an SSB, there are two OFDM symbols used forPSBCH. S-PSS occupies the 2nd, 3rd OFDM symbols, S-SSS occupies the 4thand 5th OFDM symbols. PSBCH occupies the 1st and 6th OFDM symbols. FIG.11B illustrates that, in some implementations, within an SSB, there arethree OFDM symbols used for PSBCH. Within an SSB, the 1st, 4th, and 7thOFDM symbols are used for PSBCH, 2nd and 3rd OFDM symbols are used forS-PSS, and 5th and 6th OFDM symbols are used for S-SSS. FIG. 11Cillustrates that, in some implementations, within an SSB, there are fourOFDM symbols used for PSBCH. Within an SSB, the 1st, 2nd, 7th, and 8thOFDM symbols are used for PSBCH, 3rd and 4th OFDM symbols are used forS-PSS, and 5th and 6th OFDM symbols are used for S-SSS. FIG. 11Dillustrates that, in some implementations, within an SSB, there are fourOFDM symbols used for PSBCH. Within an SSB, the 1st, 4th, 5th, and 8thOFDM symbols are used for PSBCH, 2nd and 3rd OFDM symbols are used forS-PSS, and 6th and 7th OFDM symbols are used for S-SSS. FIGS. 11A, 11B,11C, and 11D illustrate that, in some implementations, the resourcesused for PSBCH transmission include the resources used for both PSBCHpayload and DMRS. The candidate ways to multiplex DMRS and PSBCHpayload, which is illustrated in FIG. 5 and/or FIG. 10 , are alsoapplicable for FIGS. 11A, 11B, 11C, and 11D. FIGS. 11A, 11B, 11C, and11D illustrate that, in some implementations, if the frequency resourceof PSBCH is larger than S-PSS and S-SSS, part of the frequency resourceon the OFDM symbols used for S-PSS and/or S-SSS can also be used forPSBCH to align the frequency resource between PSBCH and S-SSS, orbetween PSBCH and S-PSS. One illustration of mapping PSBCH onS-PSS/S-SSS OFDM symbols of FIG. 11A is illustrated in FIG. 12 .

FIGS. 13A, 13B, and 13C illustrate that, in some implementations, withinan SSB, there is one S-PSS OFDM symbol, one S-SSS OFDM symbol. FIG. 13Aillustrates that, in some implementations, a S-PSS OFDM symbol is at thebeginning of the SSB, S-SSS OFDM symbol is at the end of the SSB, PSBCHis in between S-PSS and S-SSS, there are more than 1 OFDM symbol forPSBCH. FIG. 13B illustrates that, in some implementations, S-PSS OFDMsymbol is at the beginning of the SSB, there are more than 1 OFDM symbolfor PSBCH, the last OFDM symbol is used for PSBCH, the second last OFDMsymbol is used for S-SSS, the rest OFDM symbols of PSBCH are betweenS-PSS and S-SSS. FIG. 13C illustrates that, in some implementations, the1st OFDM symbol is used for S-PSS, the 2nd OFDM symbol is used forS-SSS, there are more than 1 OFDM symbol for PSBCH, PSBCH OFDM symbolsare after S-SSS OFDM symbol. FIGS. 13A, 13B, and 13C illustrate that, insome implementations, there can be one additional OFDM in front of thefirst OFDM of the SSB that is used as AGC, and/or one additional OFDMsymbol after the last OFDM symbol of the SSB that is used as GP. Oneillustration of FIG. 13A with additional AGC and GP symbols isillustrated in FIG. 14 .

In some implementations, the AGC symbol can be mapped with PSBCH payloador padding bits. If AGC symbol is mapped with PSBCH payload, it can becomb-like mapped, which is similar as the first OFDM symbol in FIG. 9A.The GP symbol can be left empty. Or the GP symbol can be comb-likemapped by PSBCH payload, which is similar as the last OFDM symbol inFIG. 9A, the rest resource elements that are not mapped by PSBCH areleft empty. If the frequency resource of PSBCH is larger than S-PSS andS-SSS, part of the frequency resource on the OFDM symbols used for S-PSSand/or S-SSS can also be used for PSBCH. The frequency resource of PSBCHand S-SSS can be aligned, or the frequency resource of PSBCH and S-PSScan be aligned.

In summary, for all the above implementations, there can be thefollowing characteristics:

1. The frequency resources of S-PSS and S-SSS are the same. For example,the frequency resource sizes of S-PSS and S-SSS are same. The startingpositions in a frequency domain of S-PSS and S-PSS are same.

2. For all the implementations, the S-PSS OFDM symbol(s) are in front ofS-SSS OFDM symbol(s). It is also possible that the S-SSS OFDM symbol(s)are in front of S-PSS OFDM symbol(s).

3. For comb-like resource mapping of S-PSS sequence, S-SSS sequence andPSBCH payload, the parameters configured to determine a comb-likeresource mapping are pre-configured or configured by a network.

4. The SSB can be located at the frequency center of a carrier. Or thefrequency location of SSB is pre-configured or configured by a network.

5. The position of an SSB in the time domain (for example the slot andsymbol position of SSB) is pre-configured or configured by a network.

6. The periodicity of SSB is pre-configured or configured by a network.

In summary, the above implementations have technical features asfollowing. Comb-like resource mapping of S-PSS is onto the first/lastOFDM symbol of an SSB. Comb-like resource mapping of S-SSS is onto thefirst/last OFDM symbol of an SSB. Comb-like resource mapping of PSBCH isonto the first/last OFDM symbol of an SSB. If S-PSS is comb-like mappedto one OFDM symbol, the rest OFDM symbols used for S-PSS are alsocomb-like mapped. If S-SSS is comb-like mapped to one OFDM symbol, therest OFDM symbols used for S-SSS are also comb-like mapped.

FIG. 15 is a block diagram of an example system 700 for wirelesscommunication according to an implementation of the present disclosure.Implementations described herein may be implemented into the systemusing any suitably configured hardware and/or software. FIG. 15illustrates the system 700 including a radio frequency (RF) circuitry710, a baseband circuitry 720, an application circuitry 730, amemory/storage 740, a display 750, a camera 760, a sensor 770, and aninput/output (I/O) interface 780, coupled with each other at least asillustrated.

The application circuitry 730 may include a circuitry such as, but notlimited to, one or more single-core or multi-core processors. Theprocessors may include any combination of general-purpose processors anddedicated processors, such as graphics processors, applicationprocessors. The processors may be coupled with the memory/storage andconfigured to execute instructions stored in the memory/storage toenable various applications and/or operating systems running on thesystem.

The baseband circuitry 720 may include circuitry such as, but notlimited to, one or more single-core or multi-core processors. Theprocessors may include a baseband processor. The baseband circuitry mayhandle various radio control functions that enables communication withone or more radio networks via the RF circuitry. The radio controlfunctions may include, but are not limited to, signal modulation,encoding, decoding, radio frequency shifting, etc. In someimplementations, the baseband circuitry may provide for communicationcompatible with one or more radio technologies. For example, in someimplementations, the baseband circuitry may support communication withan evolved universal terrestrial radio access network (EUTRAN) and/orother wireless metropolitan area networks (WMAN), a wireless local areanetwork (WLAN), a wireless personal area network (WPAN). Implementationsin which the baseband circuitry is configured to support radiocommunications of more than one wireless protocol may be referred to asmulti-mode baseband circuitry.

In various implementations, the baseband circuitry 720 may includecircuitry to operate with signals that are not strictly considered asbeing in a baseband frequency. For example, in some implementations,baseband circuitry may include circuitry to operate with signals havingan intermediate frequency, which is between a baseband frequency and aradio frequency. The RF circuitry 710 may enable communication withwireless networks using modulated electromagnetic radiation through anon-solid medium. In various implementations, the RF circuitry mayinclude switches, filters, amplifiers, etc. to facilitate thecommunication with the wireless network. In various implementations, theRF circuitry 710 may include circuitry to operate with signals that arenot strictly considered as being in a radio frequency. For example, insome implementations, RF circuitry may include circuitry to operate withsignals having an intermediate frequency, which is between a basebandfrequency and a radio frequency.

In various implementations, the transmitter circuitry, controlcircuitry, or receiver circuitry discussed above with respect to theuser equipment, eNB, or gNB may be embodied in whole or in part in oneor more of the RF circuitry, the baseband circuitry, and/or theapplication circuitry. As used herein, “circuitry” may refer to, be partof, or include an application specific integrated circuit (ASIC), anelectronic circuit, a processor (shared, dedicated, or group), and/or amemory (shared, dedicated, or group) that execute one or more softwareor firmware programs, a combinational logic circuit, and/or othersuitable hardware components that provide the described functionality.In some implementations, the electronic device circuitry may beimplemented in, or functions associated with the circuitry may beimplemented by, one or more software or firmware modules.

In some implementations, some or all of the constituent components ofthe baseband circuitry, the application circuitry, and/or thememory/storage may be implemented together on a system on a chip (SOC).The memory/storage 740 may be used to load and store data and/orinstructions, for example, for system. The memory/storage for oneimplementation may include any combination of suitable volatile memory,such as dynamic random access memory (DRAM)), and/or non-volatilememory, such as flash memory. In various implementations, the I/Ointerface 780 may include one or more user interfaces designed to enableuser interaction with the system and/or peripheral component interfacesdesigned to enable peripheral component interaction with the system.User interfaces may include, but are not limited to a physical keyboardor keypad, a touchpad, a speaker, a microphone, etc. Peripheralcomponent interfaces may include, but are not limited to, a non-volatilememory port, a universal serial bus (USB) port, an audio jack, and apower supply interface.

In various implementations, the sensor 770 may include one or moresensing devices to determine environmental conditions and/or locationinformation related to the system. In some implementations, the sensorsmay include, but are not limited to, a gyro sensor, an accelerometer, aproximity sensor, an ambient light sensor, and a positioning unit. Thepositioning unit may also be part of, or interact with, the basebandcircuitry and/or RF circuitry to communicate with components of apositioning network, e.g., a global positioning system (GPS) satellite.

In various implementations, the display 750 may include a display, suchas a liquid crystal display and a touch screen display. In variousimplementations, the system 700 may be a mobile computing device suchas, but not limited to, a laptop computing device, a tablet computingdevice, a netbook, an ultrabook, a smartphone, etc. In variousimplementations, system may have more or less components, and/ordifferent architectures. Where appropriate, methods described herein maybe implemented as a computer program. The computer program may be storedon a storage medium, such as a non-transitory storage medium.

Some implementations of the present disclosure provide user equipmentand a method for transmitting a synchronization signal block (SSB) ofthe same capable of performing vehicle-to-everything (V2X) communicationand improving reliability. The implementation of the present disclosureis a combination of techniques/processes that can be adopted in 3GPPspecification to create an end product.

A person having ordinary skill in the art understands that each of theunits, algorithm, and steps described and disclosed in theimplementations of the present disclosure are realized using electronichardware or combinations of software for computers and electronichardware. Whether the functions run in hardware or software depends onthe condition of application and design requirement for a technicalplan. A person having ordinary skill in the art can use different waysto realize the function for each specific application while suchrealizations should not go beyond the scope of the present disclosure.It is understood by a person having ordinary skill in the art thathe/she can refer to the working processes of the system, device, andunit in the above-mentioned implementation since the working processesof the above-mentioned system, device, and unit are basically the same.For easy description and simplicity, these working processes will not bedetailed.

It is understood that the disclosed system, device, and method in theimplementations of the present disclosure can be realized with otherways. The above-mentioned implementations are exemplary only. Thedivision of the units is merely based on logical functions while otherdivisions exist in realization. It is possible that a plurality of unitsor components are combined or integrated in another system. It is alsopossible that some characteristics are omitted or skipped. On the otherhand, the displayed or discussed mutual coupling, direct coupling, orcommunicative coupling operate through some ports, devices, or unitswhether indirectly or communicatively by ways of electrical, mechanical,or other kinds of forms. The units as separating components forexplanation are or are not physically separated. The units for displayare or are not physical units, that is, located in one place ordistributed on a plurality of network units. Some or all of the unitsare used according to the purposes of the implementations. Moreover,each of the functional units in each of the implementations can beintegrated in one processing unit, physically independent, or integratedin one processing unit with two or more than two units.

If the software function unit is realized and used and sold as aproduct, it can be stored in a readable storage medium in a computer.Based on this understanding, the technical plan proposed by the presentdisclosure can be essentially or partially realized as the form of asoftware product. Or, one part of the technical plan beneficial to theconventional technology can be realized as the form of a softwareproduct. The software product in the computer is stored in a storagemedium, including a plurality of commands for a computational device(such as a personal computer, a server, or a network device) to run allor some of the steps disclosed by the implementations of the presentdisclosure. The storage medium includes a USB disk, a mobile hard disk,a read-only memory (ROM), a random access memory (RAM), a floppy disk,or other kinds of media capable of storing program codes.

While the present disclosure has been described in connection with whatis considered the most practical and preferred implementations, it isunderstood that the present disclosure is not limited to the disclosedimplementations but is intended to cover various arrangements madewithout departing from the scope of the broadest interpretation of theappended claims.

What is claimed is:
 1. A user equipment for transmitting asynchronization signal block (SSB), comprising: a memory; a transceiver;and a processor coupled to the memory and the transceiver; wherein theprocessor is configured to control the transceiver to transmit an SSB byusing a resource set within a subframe or slot, wherein the SSBcomprises a sidelink primary synchronization signal (S-PSS), a sidelinksecondary synchronization signal (S-SSS), and a physical sidelinkbroadcast channel (PSBCH), and the resource set comprises two adjacentorthogonal frequency division multiplexing (OFDM) symbols used for theS-PSS, two adjacent OFDM symbols used for the S-SSS, and positions ofthe OFDM symbols used for the S-PSS are in front of positions of theOFDM symbols used for the S-SSS, wherein the second symbol used for theS-PSS is adjacent in time domain to the first symbol used for the S-SSS,a symbol in front of the S-PSS is used for the PSBCH, and a symbol afterthe S-SSS is used for the PSBCH, and a first OFDM symbol and a last OFDMsymbol within the SSB are used for the PSBCH.
 2. The user equipment ofclaim 1, wherein, the symbol in front of the S-PSS used for the PSBCH isthe first symbol within the SSB.
 3. The user equipment of claim 1,wherein an OFDM symbol used for the PSBCH comprises a resources used fora demodulation reference signal (DMRS) which is configured to decode thePSBCH.
 4. The user equipment of claim 1, wherein the two OFDM symbolsused for the S-PSS are the second and third OFDM symbols within the SSB,and the two OFDM symbols used for the S-SSS are the fourth and fifthOFDM symbols within the SSB.
 5. The user equipment of claim 1, whereinthe SSB is located at a frequency center of a carrier or a frequencylocation of the SSB is pre-configured or configured by a network.
 6. Theuser equipment of claim 1, wherein a position of the SSB in a timedomain is pre-configured or configured by a network.
 7. The userequipment of claim 1, wherein a periodicity of the SSB is pre-configuredor configured by a network.
 8. The user equipment of claim 1, whereinfrequency resources of the S-PSS and the S-SSS are same.
 9. The userequipment of claim 1, wherein frequency resources used for the PSBCH arelarger than frequency resources used for the S-PSS or the S-SSS.
 10. Amethod for transmitting a synchronization signal block (SSB) of a userequipment, comprising: transmitting an SSB by using a resource setwithin a subframe or slot, wherein the SSB comprises a sidelink primarysynchronization signal (S-PSS), a sidelink secondary synchronizationsignal (S-SSS), and a physical sidelink broadcast channel (PSBCH), andthe resource set comprises two adjacent orthogonal frequency divisionmultiplexing (OFDM) symbols used for the S-PSS, two adjacent OFDMsymbols used for the S-SSS, and positions of the OFDM symbols used forthe S-PSS are in front of positions of the OFDM symbols used for theS-SSS, wherein the second symbol used for the S-PSS is adjacent in timedomain to the first symbol used for the S-SSS, a symbol in front of theS-PSS is used for the PSBCH, and a symbol after the S-SSS is used forthe PSBCH, and a first OFDM symbol and a last OFDM symbol within the SSBare used for the PSBCH.
 11. The method of claim 10, wherein the symbolin front of the S-PSS used for the PSBCH is the first symbol within theSSB.
 12. The method of claim 10, wherein an OFDM symbol used for thePSBCH comprises a resources used for a demodulation reference signal(DMRS) which is configured to decode the PSBCH.
 13. The method of claim10, wherein the two OFDM symbols used for the S-PSS are the second andthird OFDM symbols within the SSB, and the two OFDM symbols used for theS-SSS are the fourth and fifth OFDM symbols within the SSB.
 14. Themethod of claim 10, wherein the SSB is located at a frequency center ofa carrier or a frequency location of the SSB is pre-configured orconfigured by a network.
 15. The method of claim 10, wherein a positionof the SSB in a time domain is pre-configured or configured by anetwork.
 16. The method of claim 10, wherein a periodicity of the SSB ispre- configured or configured by a network.
 17. The method of claim 10,wherein frequency resources of the S-PSS and the S-SSS are same.
 18. Themethod of claim 10, wherein frequency resources used for the PSBCH arelarger than frequency resources used for the S-PSS or the S-SSS.